Endgamepuzzle - Series 37

Black to move

GM_Knockout said ;

1. ...Nd6!!
2. Rh2 Ke6!
3. Rh5 Nc4
4. Rc5 Nd6
5. Re5+ Kf6
6. Rd5 Ke6
7. Rc5 Nf7
8. Ke3 Nd6
9. Kd3 Kf6
10. Kd5 Nf5+
11. Ke4 Nc6+
12. Kc5 Nf7 
13. Rc1 Kf5
14. Rf1+ Kg6
15. Ke6 Ng5+
16. Ke7 Ne4!!
17. Rf4 Ng5
18. Rf2 Ne4
19. Rf1 Ng5
20. Rf4 Nh7!
21. Ra4 Ng5
22. Ra5 Ne4
23. Ke6 Ng5+
24. Ke5 Nf7+
25. Kf4 Kf6
26. Ra6+ Ke7
27. Kf5 Nd6+
28. Ke5 Nf7+
29. Kd5 Ng5!!
30. Rg6 Nf7
31. Re6+ Kd7
32. Re3 Ng5!
33. Re5 Nf7
34. Re2 Ng5
35. Ke5 Nf7+
36. Kf6 Nd6!!
37. Rc2 Ne8+
38. Ke5 Nc7!
39. Rc5 Ne8
40. Rb5 Nc7
41. Rb6 Ne8
42. Rh6 Nc7 
43. Rd6+ Ke7
44. Rd2 Ne8
45. Rh2 Kd7
46. Rh7+ Kc6
47. Rh6+

- Game drawn with agreement 1/2 - 1/2